pigeon horntail

I have recently seen a pigeon horntail for the first time ever and was wondering can and will they sting or bite humans or animals?

Horntails don't have stingers. The long, stingerlike appendage at the rear is the ovipositor, used for laying eggs. Adult horntails drink nectar, so they don't have biting mouthparts. In short, horntails pose absolutely no threat to other animals (including humans).